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https://issues.apache.org/jira/browse/HDFS-12109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16080591#comment-16080591
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Allen Wittenauer commented on HDFS-12109:
-----------------------------------------
The HADOOP_CONF_DIR environment variable is how the shell scripts find where
hadoop-env.sh is located. Given what I can imply from your description, hadoop
3.x would work fine because it can autodetermine where stuff is located based
upon the executable location. But hadoop 2.x has a lot of bugs, so it needs to
have (minimally) HADOOP_PREFIX defined outside of the shell script code. If
that is defined, it should know where everything is located, including
auto-defining HADOOP_CONF_DIR to be HADOOP_PREFIX/etc/hadoop.
> "fs" java.net.UnknownHostException when HA NameNode is used
> -----------------------------------------------------------
>
> Key: HDFS-12109
> URL: https://issues.apache.org/jira/browse/HDFS-12109
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: fs
> Affects Versions: 2.8.0
> Environment: [hadoop@namenode01 ~]$ cat /etc/redhat-release
> CentOS Linux release 7.3.1611 (Core)
> [hadoop@namenode01 ~]$ uname -a
> Linux namenode01 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC
> 2017 x86_64 x86_64 x86_64 GNU/Linux
> [hadoop@namenode01 ~]$ java -version
> java version "1.8.0_131"
> Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
> Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
> Reporter: Luigi Di Fraia
>
> After setting up an HA NameNode configuration, the following invocation of
> "fs" fails:
> [hadoop@namenode01 ~]$ /usr/local/hadoop/bin/hdfs dfs -ls /
> -ls: java.net.UnknownHostException: saccluster
> It works if properties are defined as per below:
> /usr/local/hadoop/bin/hdfs dfs -Ddfs.nameservices=saccluster
> -Ddfs.client.failover.proxy.provider.saccluster=org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider
> -Ddfs.ha.namenodes.saccluster=namenode01,namenode02
> -Ddfs.namenode.rpc-address.saccluster.namenode01=namenode01:8020
> -Ddfs.namenode.rpc-address.saccluster.namenode02=namenode02:8020 -ls /
> These properties are defined in /usr/local/hadoop/etc/hadoop/hdfs-site.xml as
> per below:
> <property>
> <name>dfs.nameservices</name>
> <value>saccluster</value>
> </property>
> <property>
> <name>dfs.ha.namenodes.saccluster</name>
> <value>namenode01,namenode02</value>
> </property>
> <property>
> <name>dfs.namenode.rpc-address.saccluster.namenode01</name>
> <value>namenode01:8020</value>
> </property>
> <property>
> <name>dfs.namenode.rpc-address.saccluster.namenode02</name>
> <value>namenode02:8020</value>
> </property>
> <property>
> <name>dfs.namenode.http-address.saccluster.namenode01</name>
> <value>namenode01:50070</value>
> </property>
> <property>
> <name>dfs.namenode.http-address.saccluster.namenode02</name>
> <value>namenode02:50070</value>
> </property>
> <property>
> <name>dfs.namenode.shared.edits.dir</name>
>
> <value>qjournal://namenode01:8485;namenode02:8485;datanode01:8485/saccluster</value>
> </property>
> <property>
> <name>dfs.client.failover.proxy.provider.mycluster</name>
>
> <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
> </property>
> In /usr/local/hadoop/etc/hadoop/core-site.xml the default FS is defined as
> per below:
> <property>
> <name>fs.defaultFS</name>
> <value>hdfs://saccluster</value>
> </property>
> In /usr/local/hadoop/etc/hadoop/hadoop-env.sh the following export is defined:
> export HADOOP_CONF_DIR="/usr/local/hadoop/etc/hadoop"
> Is "fs" trying to read these properties from somewhere else, such as a
> separate client configuration file?
> Apologies if I am missing something obvious here.
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